Grain-grinding machine



J. K. STRACHAN.

GRAIN GRINDING MACHINE.

APPLICATION nuzo FEB. 25, 1922.

1,423,275, Patented July 18, 1922.

JAMES K. STRACI-IAN,

OF WINDSOR, UN'IARIG, CANADA.

GRAIN-GRINDING- IVIACHINE.

Application filed FebruaryQS, 1922.

To aZZ whom it may concern Be it known that I, Jinrns K. StrRAo iaN, a citizen of the United States, residing at lVindsor, in the Province of Ontario and Dominion of Canada, have invented certain new and useful Improvements in Grain Grinding Machines, of which the following is a specification, reference being had. to the accompanying drawings.

It is the purpose of the present invention to provide a machine of this character wherein a stationary grid is employed, in combination with revolving corrugated grinding surfaces on opposite sides of the grid used for grinding and crushing the grain as it leaves the hopper. One of said grinding surfaces, which is carried by a revolving burr is provided with diametrically opposite pockets to receive the grain from the hopper, the beveled surfaces of the poclrets acting to first crush the grain, whereby the grain may be ground on both sides of the grid.

Another purpose consists in the provision of a machine including a stationary grid, on both sides of which the grain may be ground, thus eliminating the end thrust of the burr which is common in other grinding machines.

A still further purpose is the provision of a revoluble burr provided with diametrically opposite radial pockets, having beveledsurfaces, together with corrugations or ribs on the end of the burr extending ta-ngentially to the surface of the reduced extension of the burr, acting materially to force the grain through the grid, and in accomplishinc this action to cause the grain to be crushed and ground between the ribs,

which subdivide the grid into the openings or pockets.

A still further purpose is the provision of a grinding plate adjacent the outer face of the stationary grid, between which and the grid, the grain which is not entirely crushed or ground between the grid and the burr, may be additionally crushed and ground to a finer state.

A further purpose is the provision of a grinding machine, wherein a stationary grid is employed, together with opposite grinding surfaces having opposite tangential cor rugations or ribs, whereby the grinding of the grain may be accomplished on both sides of the grid.

Specification of Letters Patent.

made in the apparatus and combination atter set forth,

through the improved bottom 2 of the hopper Patented July is, was. Serial No. 539,166.

. A still further purpose is the provision of a machine including cranks or other means on both ends of the burr, to facilitate the rotation of the burr as well as the grinding plate on the outer face of the grid.

It is to be understood that the particulars herein given are in no way limitative and that while still keeping within thescope of the-invention, any desired modifications of detail and desired proportions may be according to circum stances.

The invention comprises further features of parts, as will be hereinshown in the drawings and claimed; I

In the drawings Figure 1 is a vertical sectional view grain grinding machineconstructed in accordance with the invention;

Figure 2 is a sectional view on line 2 2 of Figure 1, showing the grinding face of the revoluble burr;

Figure 3 is a sectional view on line 33 of Figure 1 showing the construction of the stationary grid, together with the grinding surface of a plate on the exterior of the grid, showing the corrugations or ribs as being tangentially oppositely disposed to the corrugations or ribs of the grinding surface of the burr. f

Referring to the drawings, 1 designates a hopper, which receives the grain, and the is inclined, for the purpose of causing the grain (which is deposited in the hopper) to feed toward the discharge opening 3 of the hopper.

The hopper at its lower portion terminates in a cylindrical casing 4, which re ceives a revoluble burr 5. One end of the casing 4.- has an integral stationary grid 6. This grid comprises a circular or annular band '7 including a plurality of radial bars 8, which integrall T connect to the cylindrical wall of the casing The opposite end I of the casing t is normall open, that is when the grinding elements of the grinder are removed or disassembled. However, the revoluble burr is received in the casing 4-, the end 9 of which is closed by a plate 10. The burr has a shank 11 at one end. This shank has a rectangular or square portion 12 which carries the plate 10, the plate rotating with the shank, andalso rotating crank as connected to the shank with the shank is a crank 13, which fits the rectangular or square portion of the shank. A suitable nut 14 is threaded upon the reduced extension 15 of the shank, to not only hold the plate 10 in place, but also to hold the of the burr.

The opposite end of the burr has a shank 16 which revolubly fits the band 7 and engaging the rectangular portion 17 of the shank 16 is a grinding plate 18. lVhile the grinding plate 18 is shown immediately adjacent the grid 6, it is to be noted that in actual practice the grinding plate 18 is usually spaced a slight distance from the face of the grid, to more readily accommodate the grain. ln this way the two grinding elements are capable of looseness of play, to permit the grain to pass between the grinding surfaces and the grid. Owing to this arrangement, it is obvious that the position of the grinding plate 18 and the burr can be adjusted relatively to the grid. Say for instance should the nut 20 be adjusted, so that the grinding plate could be positioned, say for instance a sixteenth of an inch from the face of the grid, the two grinding elements would be more or less loose, with relation to the grid, obviously grain of different sizes could be ground, and also by tightening or loosening the nut 20, the grain could be ground coarse or fine, as may be desired. A crank 19 is also fitted to the rectangular portion 17 of the shank 16 so as to rotate therewith, there being a nut 20, which is threaded upon the reduced extension 21 of the shank 16, as to hold the grinding plate 18 and the crank as connected to and movable with the: burr. Obviously the burr is rotated by two cranks, whereas in other grinding machines the burr is usually rotated by a single crank. One end of the burr 5 is provided with diametrically opposite radial pocket-s 22, and the same end of the burr is provided with a plurality of corrugations or ribsr23, which are tangentially disposed. These corrugations or ribs are also formed on the inclined surfaces 24 of the pockets 22, acting materially to cause the grain to wedge between the inclined surfaces or walls of the pocket and the grid, for the purpose of crus ing and grinding the same. The particles of grain which are not ground by these surfaces and the grid are ground between the grid and the corrugations 25 of the plate 18. The corrugations 25 are also tangentially disposed, but opposite to the tangential dispositions of the corrugations of the burr, thereby facilitating the grinding of the grain. In fact the grain is more finely ground between the grid and the corrugations of the plate 18.

As the grain is ground, it passes out through the discharge passage 26, which forms an integral part of the casing L. The casing 4: is carried by a standard 27, which rises from the base 28.

The invention having been set forth, what is claimed is 1. In a grinding machine as set forth, the combination with a casing having a hopper thereabove, an opening communicating with the hopper and the casing, one end of the casing having a stationary grinding grid, a revoluble burr mounted in said casing and provided on one end with diametrically opposite pockets to register with the opening oftcommunication, to carry the grain from the opening to and between the burr and the grid for grinding and crushing the same, and a grinding plate carried by and rotatable with the burr and operating on the exterior of the grid, and means for operating the burr. V v

2. In a grain grinding machine, a casing provided with a stationary grid at one end, a pair of grinding elements on opposite sides of and cooperating with the grid, the grinding surface of one element having tangential corrugations, those of one surface being tangentially opposite those of' the other surface, the grinding surface of one of said elements having diametrically opposite pockets provided with inclined surfaces, which act to wedge the grain between the grinding element and the grid, and means for rotating one of said grinding elements 3.111 a grain grinding machine, a casing having a stationary grid at one end, a revoluble burr operatively mounted in said casing provided with a grinding face having tangential corrugations, said face having diametrically opposite V-shaped pockets, the inclined walls of which also include the cor rugations, saidpockets with their inclined surfaces acting to wedge the grain between the grinding face and the grid, a grinding plate on the exterior of said grid and movable relatively thereto and provided with corrugations, which are oppositely tangential to the corrugations of the burr, to facilitate the grinding of the grain, a crank on opposite ends of the burr, means cooperating with one end of the burr and the crank for holding the latter and the plate in position, said plate being adjustable, to facilitate grinding the grain to a fine state.

i. In a grinding machine as set forth, the combination with a cylindrical casing having ahopper thereabove, said hopper having an opening communicatively connecting with the casing at one end thereof, said casing be ing hollow throughout its length and provided at one end with a grinding grid, of a revoluble body rotatably mounted in and being substantially corresponding in length with and cylindrically fitting within said casing, said body having a grinding face at one end located adjacent the grid, and between which and the grid the grain from said opening becomes ground, said body having axially aligned extensions,"one having a bearing in said grid, a second grinding element adj aoent to and cooperating on the other side of the grid and being movable with one of said extensions, and means carried by both extensions for rotating the cylindrical body and both grinding elements.

5. In a grinding machine as set forth, the combination with a cylindrical casing having a hopper thereabove, said hopper having an opening communicatively connecting with the casing at one end thereof, said casing being hollow throughout its length and provided at one end with a grinding grid, of a revoluble body rotatably mounted in and being substantially corresponding in length with and cylindrically fitting Within said casing, said body having a grinding face at one end located adjacent the grid, and between which and the grid the grain from said opening becomes ground, said body having axially aligned extensions, one having a bearing in said grid, a second grinding element adjacent to and cooperating on the other side of the grid and being movable with one of said extensions, means for holding the last mentioned grinding element adjustably on the extension, the construction and arrangement and the adjustment of said holding means being such as to result in the adjustment of said body and its grinding face, when the second grinding element is allowed to be adjusted, and means carried by both extensions for rotating the cylindrical body and both grinding elements.

In testimony whereof I hereunto aflix my signature.

JAMES K. STRAOHAN. 

